Abstract
A new extinct genus and species of Anostraca (Crustacea, Branchiopoda), Daohugounaias cheni gen. et sp. nov. is described based on a well-preserved specimen from the Middle Jurassic of Daohugou, Inner Mongolia, China. The new genus differs from other Anostraca by the short, forward-pointing spines at the joint of the abdomen and brood pouch. Scanning electron microscopy (SEM) shows that eggs are preserved in three-dimension and some ridges and spines remain on their surfaces. Energy dispersive X-ray (EDS) demonstrates that the relatively abundance or depletion of elements vary between different parts of the body. The new discovery fills a stratigraphical gap in the Anostraca and supports the previous palaeoenvironmental reconstruction of the Daohugou area.
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